6Cassetti, Emilio. Equilibrium population partitions between urban and agricultural occupations. Geographical Analysis, 1980, 12(1). 47-54.
7Krugman, Paul R. The international role of the dollar: theory and prospect, in: Exchange Rate Theory and Practice. Chicago: University of Chicago Press, 1984.
8Blume,Lawrence E.The statistical mechanics of strategic interactions. Games and Economic Bahavior,1993, 5(3):387-426.
9Brock, William A. Pathways to randomness in the economy: emergent nonlinearity in economics and finance. Estudios Econokmicos Enero-Junio, 1993.